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Does the capital letter n represent an integer or a positive integer mathematically?
Special symbol of public number set. N: non-negative integer set (or natural number set) (the set of all non-negative integers); N* or N+: a set of positive integers (a set with no 0 in the non-negative integer set n); Z: integer set (the set of all integers); Q: rational number set (the set of all rational numbers); R: set of real numbers (set of all real numbers)